Answer: 1184Å
Explanation: in the thomson atom,the electrons are disappeared through a positive nuclear fluid.applying gauss's law V.E=P/Ɛₒ ,∫E.da=q/Ɛₒ integrating over the inner sphere, we obtain E.4πr²=P4/3πr³/Ɛₒ E=e/4πƐₒR³

Answer: most electron in matter are effectively free and at rest
Explanation:

Q: an atom has three of states valence electrons in p shell.determine the total number os state in this configuration.that is,how many distinct three electron states can be constructed from the orbits in a p-shell

Answer: 20
Explanation: the s shell has l=0 and the p shell has l=1 hence m₁=-1,0,1.the possible states taking each electron seperately are then where the first electron is on the first line the second electron I the second line-,the third electron in the third line .we count states with two electrons in one state and the other electron separate.hence there are total of 20 states as expect from the binomial coefficient (6 3)=61/3131=20

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